Focus on the relationship (of the 3 branches) and durability of (separation of powers) argument. What about the separation of powers construct ensures its continued durability? How is the separation of powers construct manifesting itself in today’s world?

Focus on the relationship (of the 3 branches) and durability of (separation of powers) argument. What about the separation of powers construct ensures its continued durability? How is the separation of powers construct manifesting itself in today’s world?